现在完成时中几个标志性词

1、学习必备欢迎下载现在完成时中几个标志性词 ( 组) 的讲解与演练我们都知道，现在完成时常见的标志词包括以下词语：just ， ever ， never ，yet ， already， for ，before ，since ， so far ， recently，twice ，three times 等。虽然同为标志词，但它们的用法却不尽相同。这里试就其中几个易混淆的词做一简要讲解，供同学们学习参考：1.ever ，never ：ever 意为“曾经”，本身为肯定意义，可用于肯定、否定和疑问句中；never 意为“从不”，本身具有否定意义。1)Have you ever seen that ki

2、nd of animal?你以前曾经见过那种动物吗？2)I have ever been to London.我曾经去过伦敦。3)No one ever known the news about him.没有人知道有关他的消息。4)She has never told us about herself.她从未告诉我们有关她的事情。2. already ，yet ：二者都有“已经”的意思，但 already常用于肯定句的中间， yet 则多用于否定、 疑问句末， 常表示“已经， 还没有”。1)I have already had lunch.我已经吃过午饭了。2)-Have you finish

3、ed your homework yet?你已经完成你的作业了吗？ -No, not yet.还没有。3. for，since：如果想表达“我在北京已经居住了10 年”这个意思，既可以说: I have lived in Beijing for 10 years.也可以说 :I have lived in Beijing since 1996.也就是说, for表示“到.的数量”，常和一段时间连用；而since表示“自从.以来”,其后常跟过去某一起始时间点或过去的动作。又如: The boy has studied all the time since he came into the roo

4、m.4. before ：“以前” , 在现在完成时中，一般放在句末。1)I think I have met you before.我想我以前见过你。2)It seems that I have been here before.我似乎以前来过这里。实战演练：一、用括号中动词的适当形式填空：1. _she _ (wait) for an hour yet?2. He_(not finish) the work yet.3. Li Ming _(know) him since then.4. I _(receive) a letter from my brother recently.5. W

5、e _ (be) there many times.6. How long _ you _ (learn) English?7. Wang Ming _ (not read) the book before.8. -He _ (live) in this city since he _ (leave) his hometown. -When did he _ (leave) there?-He _ (leave)there three years ago.9. -His father _ (be) in the Party for years.-When _ he _ (join) the P

6、arty?-He _ (join) the Party in 1996.10.- It _ (rain) for such a long time!- When _ it _ (rain)? -It _ (rain) 3 hours ago.二、根据中英文提示完成句子。1. 我爸爸已经工作了 25 年了。 my father, work, for , 25 years_2. 你学英语有多久了？ how long, you, learn, English_3. 他自上中学就买了这辆自行车。he, have, bike, since, study, middle school_4.这本书我已读了一个月了。I,